1, factory graphic design
Column spacing is 6m, horizontal positioning axis is denoted by ①, ② ..., spacing is 6m, and longitudinal positioning axis is denoted by? 、? 、? Indicates the span size of the spacing, i.e.? ~? Axis distance is 18m. ~? Axis distance is 24m.
In order to arrange the wind-resistant columns, the end columns are 600mm away from the transverse positioning axis (inward), and the centroid of the rest bent columns coincides with the transverse positioning axis.
? ~? 、? ~? The lifting capacity of the crane on this bridge is equivalent to 20 tons. 、? The columns are initially assembled in a closed manner, and the longitudinal positioning axis coincides with the outer edge of the side column.
Whether to adopt non-closed combination and connection size should be based on the gap size b between the outer edge of crane frame and the inner edge of upper column. Of course.
b？ = λ-(B？ +B？ ) should meet:
b？ ≥ 80mm Q≤50t
For a 20t crane, B? = 260 mm
Suppose the section height of the upper column is 400mm, then b? = 400 mm
For what? 、? Column, b? = 750-(260+400) = 90mm & gt80mm, which meets the requirements.
For contour bending, the center of the section of the upper column of the central column coincides with the longitudinal positioning axis, and the gap size between the outer edge of the crane frame and the inner edge of the upper column can meet the requirements.
Workshop length is 66m, less than 100m, without expansion joints.
2, component selection and layout
(1) roof member
① Roof slabs and panels
For the model of roof panel, check 92G4 10 (1) according to the design value of roof surface load (excluding the weight of roof). When the inclined length of the roof truss is not an integer multiple of the width of the roof panel 1.5m, the panel needs to be arranged. Panel inspection 92G4 10 (2)
Load:
Two-felt and three-oil waterproof layer 1.2 x 0.35 = 0.42KN/m?
20mm thick cement mortar screed-coat 1.2×0.02×20 = 0.48 kn/m?
Roof uniformly distributed live load (unoccupied) 1.4 x 0.5 = 0.70KN/m?
Snow load1.4x1.0x0.5 = 0.70kn/m?
Millet 1.60KN/m?
Prestressed concrete roof slab is adopted. According to the allowable design value of uniformly distributed load, 1.60KN/m? , check the atlas, choose y-WB-1Ⅱ in the middle, and finally choose y-WB-1Ⅱ s, and its allowable external load is 1.99KN/m? & gt 1.60KN/m？ , plate weight 1.40KN/m? .
The panel is made of reinforced concrete slab. Look up the table and select KWB- 1 in the middle. It ends with kwb-1s. The allowable external load is 3.35KN/m? & gt 1.60KN/m？ . The plate weight is 1.70KN/m? .
② grooved plate
It is necessary to set a gutter when the roof panel adopts organized water distribution. For a single span, you can use an outer gutter or an inner gutter. For multi-spans, only inner gutters can be used.
Check the type of trench according to the increased average wiring load value (92G4 10). When calculating the waterlogging load in the gutter. According to the maximum depth of the drainage ditch. There are three kinds of the same type of gutter slab: non-perforated, perforated and end wall. The gutter plate at the downpipe needs to be opened, which is divided into left opening and right opening, which are respectively denoted by "A" and "B", and the gutter plate with end wall at the end of the factory building is denoted by "sa" and "sb".
In this case, the downpipe is arranged outside the shafts ②, ④, ⑥, ⑧ and ⑩.
The width of the inner gutter is 620mm, and the width of the outer gutter is 770mm. ..
External drain load:
Slag slope1.2x1.5x0.77 =1.39kn/m?
Two-felt and three-oil waterproof layer 1.2 x 0.35 x 0.77 = 0.32KN/m?
20mm cement mortar leveling layer1.2x0.02x0.77 = 0.37kn/m?
Cumulative water load1.4x10x0.13x0.77 =1.40kn/m?
Uniform live load on roof 1.4×0.5×0.77 = 0.54 kn/m?
Xiaomi 3.48KN/m?
Look-up table shows that TGB77- 1 is generally used for the gutter plate, TGB77- 1a or TGB77- 1b for the perforated gutter plate, and TGB77- 1sa or TGB77- 1sb for the end, and the allowable external load is 4. .
In the same way, the design value of external load in the inner gutter is 2.8 1KN/m, please look it up. Generally, the gutter plate is TGB662- 1, the perforated gutter plate is TGB62- 1a or TGB62- 1b, and the terminal is TGB62- 1sa or 0. 2.8 1KN/m？ , weighing 2.06KN/m? .
(2) Roof truss and support
According to the design values of roof load, skylight type, crane and cornice shape, the model of roof truss is selected. Reinforced concrete broken-line roof truss can be used when the span is small. Check 95G3 14. Prestressed broken-line roof truss can be used for large span, see 95G4 14.
In this case, there is no skylight, the code is a, and the shape of the cornice is an outer gutter at one end and an inner gutter at the other end, and the code is d.
Roof load:
The load from the roof panel is 1.60KN/m?
The deadweight of the roof panel is1.2x1.4 =1.68kn/m?
Sealing weight1.2x0.1= 0.12kn/m?
3.40KN/m？
18m span adopts prestressed concrete roof truss, with YWJ- 18- 1Da in the middle and ywj-18-/da' at both ends, and the allowable external load is 3.5KN/m? & gt3.40KN/m？ , weighing 67.6KN.
The 24m span adopts prestressed concrete roof truss, with YWJ-24- 1Da in the middle and YWJ-24- 1Da' at both ends.
The allowable external load is 3.5KN/m? & gt3.40KN/m？ , self-weight104.66kn.
Non-seismic and anti-seismic policies, the fortification intensity is 6 or 7 degrees, and the roof support can be arranged according to the drawing 1
When the workshop unit is not more than 66m, the vertical support at the end of the roof truss is represented by CC- 1, and the vertical support at the middle of the roof truss is represented by CC-2. When the workshop unit is larger than 66m, vertical support CC-3 is added at the end of the roof truss outside the inter-column support. The horizontal tie rod in the middle of the roof truss is represented by GX-2. The lateral horizontal support of the upper chord of the roof truss is represented by SC. When the lifting capacity of the crane is large and other vibration equipment or horizontal load produces horizontal force on the lower chord of the roof truss, it is necessary to set the horizontal support of the lower chord. The lateral horizontal support of the lower chord is denoted by XC. When the workshop is equipped with corbel, it is also necessary to arrange the longitudinal horizontal support of the lower chord. In this case, it is not necessary to provide longitudinal horizontal support.
(3) Crane beam
The crane beam model is selected according to the rated lifting weight of the crane, the span of the crane (Lk=L-2λ) and the load state of the crane. Among them, reinforced concrete crane beam can be inspected 95G323, pretensioned prestressed concrete crane beam can be inspected 95G425 and post-tensioned concrete crane beam can be inspected 95G426.
The span is 18m, and the lifting capacity of the crane is 20t. Under heavy load, lk =18-2x0.75 =16.5m, and the reinforced concrete crane beam is adopted. Look-up table shows that the middle span is DLZ-8Z, the side span is DLZ-8B, and the beam height is 1200mm.
The span is 24m, the lifting capacity of the crane is 20t, and the overloaded state Lk = 24-2x0.75 = 22.5m Look up the table, the middle span is DLZ-8Z, the side span is DLZ-8B, the beam height is 1200mm, and the dead weight is 39.98KN.
(4) Foundation beam
The model of foundation beam should be checked according to the span, wall height and whether there are doors and windows.
The wall is 240mm thick and protrudes outside the column. Look-up table shows that JL-3 is selected in the middle of longitudinal wall, JL- 15 is selected for the side span of longitudinal wall, and JL- 14 is selected for the 6m column spacing of gables.
(5) Support between columns
The inter-column support is arranged between the axes ⑥ and ⑥. The support number can be found in Table 97G336. Firstly, according to the crane lifting weight, column top elevation, bracket top elevation, crane beam top elevation, upper column height, roof truss span and so on, the number of bent frames was investigated. , and then determine the support model according to the basic wind pressure of bent frame. Look up the table and select the support between columns.
(6) Wind-resistant column
The lower column of the wind-resistant column adopts I-shaped section, and the upper column adopts rectangular section. The maximum span of foundation beam should be considered in the layout of wind-resistant columns. 18m-span and 24m-span wind-resistant columns are arranged at equal intervals along the gables, with an interval of 6m.
3. Workshop section design
The content of longitudinal section design is to determine the control elevation of the factory building, including bracket top elevation, column top elevation and ring beam elevation.
The elevation at the top of the bracket is equal to the elevation at the top of the rail minus the height of the crane beam at the bracket and the height of the rail and cushion, which must meet the multiple of 300 mm ... The height of the crane rail and cushion can be 0.2m In order to make the elevation of the bracket top meet the requirements of the module, the actual elevation of the rail top will be different from the marked height, and the specification allows the actual elevation of the rail top to differ from the marked elevation by 200mm. Column top elevation H= crane rail top elevation HA+ crane rail top to bridge top height HB+ clearance HC, which should not be less than 220mm, the height from crane rail top to bridge top surface can be checked at 95G323, and the column top elevation also meets the multiple of 300 mm ..
Due to technological requirements, the elevation of rail top is 9m.
For18m span:
The height of bracket top is 7.5m, and the height of crane beam is1.2m. If the height of crane track and cushion is 200mm, the track structure height HA=7.5+ 1.2+0.2=8.9, and the structure height-sign height = 8.9-9 =-0.1. Look-up table shows that the height HB from the crane rail top to the bridge top is 2.099m, then H = HA+HB+HC = 8.9+2.099+0.22 =1.219m ... To meet the requirements of modulus, H =/kloc-0 is taken. ..
For a span of 24 meters:
The height of bracket top is 7.5m, and the height of crane beam is1.2m. If the height of crane track and cushion is 200mm, the track structure height HA=7.5+ 1.2+0.2=8.9, and the structure height-sign height = 8.9-9 =-0.1. Look-up table shows that the height HB from the crane rail top to the bridge top is 2. 189 m, then h = ha+HB+HC = 8.9+2.189+0.22 =1.309 m .. To meet the modulus requirements, ..
For workshops with cranes, in addition to setting ring beams at eaves or window tops, one should be added at the elevation of crane beams. When the height of external walls is greater than 15m, one should be added appropriately. The connection between ring beam and column generally adopts anchor bar 2? 10 or 2? 12。
At present, there are three ring beams with elevations of 4.8m, 8.7m and1.16m, which are respectively marked as QL- 1, QL-2 and QL-3. Among them, the ring beam at the top of the column can replace the coupling beam. The cross section of ring beam is 240mmX240mm, and the reinforcement is 4? 12、 ? 6@200。 The reinforcement of ring beam at lintel shall be calculated separately.